package com.jerry.walking.utils;

import java.util.ArrayDeque;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import android.annotation.TargetApi;
import android.os.Handler;
import android.os.Message;
import android.os.Process;

/**
 * ************************************* Copied from JB release framework:
 * https:
 * //android.googlesource.com/platform/frameworks/base/+/jb-release/core/java
 * /android/os/AsyncTask.java
 * <p/>
 * so that threading behavior on all OS versions is the same and we can tweak
 * behavior by using executeOnExecutor() if needed.
 * <p/>
 * There are 3 changes in this copy of AsyncTask: -pre-HC a single thread
 * executor is used for serial operation (Executors.newSingleThreadExecutor) and
 * is the default -the default THREAD_POOL_EXECUTOR was changed to use
 * DiscardOldestPolicy -a new fixed thread pool called DUAL_THREAD_EXECUTOR was
 * added *************************************
 * <p/>
 * <p>
 * AsyncTask enables proper and easy use of the UI thread. This class allows to
 * perform background operations and publish results on the UI thread without
 * having to manipulate threads and/or handlers.
 * </p>
 * <p/>
 * <p>
 * AsyncTask is designed to be a helper class around {@link Thread} and
 * {@link Handler} and does not constitute a generic threading framework.
 * AsyncTasks should ideally be used for short operations (a few seconds at the
 * most.) If you need to keep threads running for long periods of time, it is
 * highly recommended you use the various APIs provided by the
 * <code>java.util.concurrent</code> pacakge such as {@link Executor},
 * {@link ThreadPoolExecutor} and {@link FutureTask}.
 * </p>
 * <p/>
 * <p>
 * An asynchronous task is defined by a computation that runs on a background
 * thread and whose result is published on the UI thread. An asynchronous task
 * is defined by 3 generic types, called <code>Params</code>,
 * <code>Progress</code> and <code>Result</code>, and 4 steps, called
 * <code>onPreExecute</code>, <code>doInBackground</code>,
 * <code>onProgressUpdate</code> and <code>onPostExecute</code>.
 * </p>
 * <p/>
 * <div class="special reference"> <h3>Developer Guides</h3>
 * <p>
 * For more information about using tasks and threads, read the <a
 * href="{@docRoot}
 * guide/topics/fundamentals/processes-and-threads.html">Processes and
 * Threads</a> developer guide.
 * </p>
 * </div>
 * <p/>
 * <h2>Usage</h2>
 * <p>
 * AsyncTask must be subclassed to be used. The subclass will override at least
 * one method ({@link #doInBackground}), and most often will override a second
 * one ({@link #onPostExecute}.)
 * </p>
 * <p/>
 * <p>
 * Here is an example of subclassing:
 * </p>
 * <p/>
 * <pre class="prettyprint">
 * private class DownloadFilesTask extends AsyncTask&lt;URL, Integer, Long&gt;
 * {
 * protected Long doInBackground(URL... urls)
 * {
 * int count = urls.length;
 * long totalSize = 0;
 * for (int i = 0; i &lt; count; i++)
 * {
 * totalSize += Downloader.downloadFile(urls[i]);
 * publishProgress((int) ((i / (float) count) * 100));
 * // Escape early if cancel() is called
 * if (isCancelled())
 * break;
 * }
 * return totalSize;
 * }
 * <p/>
 * protected void onProgressUpdate(Integer... progress)
 * {
 * setProgressPercent(progress[0]);
 * }
 * <p/>
 * protected void onPostExecute(Long result)
 * {
 * showDialog(&quot;Downloaded &quot; + result + &quot; bytes&quot;);
 * }
 * }
 * </pre>
 * <p/>
 * <p>
 * Once created, a task is executed very simply:
 * </p>
 * <p/>
 * <pre class="prettyprint">
 * new DownloadFilesTask().execute(url1, url2, url3);
 * </pre>
 * <p/>
 * <h2>AsyncTask's generic types</h2>
 * <p>
 * The three types used by an asynchronous task are the following:
 * </p>
 * <ol>
 * <li><code>Params</code>, the type of the parameters sent to the task upon
 * execution.</li>
 * <li><code>Progress</code>, the type of the progress units published during
 * the background computation.</li>
 * <li><code>Result</code>, the type of the result of the background
 * computation.</li>
 * </ol>
 * <p>
 * Not all types are always used by an asynchronous task. To mark a type as
 * unused, simply use the type {@link Void}:
 * </p>
 * <p/>
 * <pre>
 * private class MyTask extends AsyncTask&lt;Void, Void, Void&gt; { ... }
 * </pre>
 * <p/>
 * <h2>The 4 steps</h2>
 * <p>
 * When an asynchronous task is executed, the task goes through 4 steps:
 * </p>
 * <ol>
 * <li>{@link #onPreExecute()}, invoked on the UI thread immediately after the
 * task is executed. This step is normally used to setup the task, for instance
 * by showing a progress bar in the user interface.</li>
 * <li>{@link #doInBackground}, invoked on the background thread immediately
 * after {@link #onPreExecute()} finishes executing. This step is used to
 * perform background computation that can take a long time. The parameters of
 * the asynchronous task are passed to this step. The result of the computation
 * must be returned by this step and will be passed back to the last step. This
 * step can also use {@link #publishProgress} to publish one or more units of
 * progress. These values are published on the UI thread, in the
 * {@link #onProgressUpdate} step.</li>
 * <li>{@link #onProgressUpdate}, invoked on the UI thread after a call to
 * {@link #publishProgress}. The timing of the execution is undefined. This
 * method is used to display any form of progress in the user interface while
 * the background computation is still executing. For instance, it can be used
 * to animate a progress bar or show logs in a text field.</li>
 * <li>{@link #onPostExecute}, invoked on the UI thread after the background
 * computation finishes. The result of the background computation is passed to
 * this step as a parameter.</li>
 * </ol>
 * <p/>
 * <h2>Cancelling a task</h2>
 * <p>
 * A task can be cancelled at any time by invoking {@link #cancel(boolean)}.
 * Invoking this method will cause subsequent calls to {@link #isCancelled()} to
 * return true. After invoking this method, {@link #onCancelled(Object)},
 * instead of {@link #onPostExecute(Object)} will be invoked after
 * {@link #doInBackground(Object[])} returns. To ensure that a task is cancelled
 * as quickly as possible, you should always check the return value of
 * {@link #isCancelled()} periodically from {@link #doInBackground(Object[])},
 * if possible (inside a loop for instance.)
 * </p>
 * <p/>
 * <h2>Threading rules</h2>
 * <p>
 * There are a few threading rules that must be followed for this class to work
 * properly:
 * </p>
 * <ul>
 * <li>The AsyncTask class must be loaded on the UI thread. This is done
 * automatically as of {@link android.os.Build.VERSION_CODES#JELLY_BEAN}.</li>
 * <li>The task instance must be created on the UI thread.</li>
 * <li>{@link #execute} must be invoked on the UI thread.</li>
 * <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
 * {@link #doInBackground}, {@link #onProgressUpdate} manually.</li>
 * <li>The task can be executed only once (an exception will be thrown if a
 * second execution is attempted.)</li>
 * </ul>
 * <p/>
 * <h2>Memory observability</h2>
 * <p>
 * AsyncTask guarantees that all callback calls are synchronized in such a way
 * that the following operations are safe without explicit synchronizations.
 * </p>
 * <ul>
 * <li>Set member fields in the constructor or {@link #onPreExecute}, and refer
 * to them in {@link #doInBackground}.
 * <li>Set member fields in {@link #doInBackground}, and refer to them in
 * {@link #onProgressUpdate} and {@link #onPostExecute}.
 * </ul>
 * <p/>
 * <h2>Order of execution</h2>
 * <p>
 * When first introduced, AsyncTasks were executed serially on a single
 * background thread. Starting with {@link android.os.Build.VERSION_CODES#DONUT}
 * , this was changed to a pool of threads allowing multiple tasks to operate in
 * parallel. Starting with {@link android.os.Build.VERSION_CODES#HONEYCOMB},
 * tasks are executed on a single thread to avoid common application errors
 * caused by parallel execution.
 * </p>
 * <p>
 * If you truly want parallel execution, you can invoke
 * {@link #executeOnExecutor(Executor, Object[])} with
 * {@link #THREAD_POOL_EXECUTOR}.
 * </p>
 */
public abstract class AsyncTask<Params, Progress, Result>
{
    private static final String LOG_TAG = "AsyncTask";

    private static final int CORE_POOL_SIZE = 5;
    private static final int MAXIMUM_POOL_SIZE = 128;
    private static final int KEEP_ALIVE = 1;

    private static final ThreadFactory sThreadFactory = new ThreadFactory()
    {
        private final AtomicInteger mCount = new AtomicInteger(1);

        public Thread newThread(Runnable r)
        {
            return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
        }
    };

    private static final BlockingQueue<Runnable> sPoolWorkQueue = new LinkedBlockingQueue<Runnable>(
            10);

    /**
     * An {@link Executor} that can be used to execute tasks in parallel.
     */
    public static final Executor THREAD_POOL_EXECUTOR = new ThreadPoolExecutor(CORE_POOL_SIZE,
            MAXIMUM_POOL_SIZE, KEEP_ALIVE, TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory,
            new ThreadPoolExecutor.DiscardOldestPolicy());

    /**
     * An {@link Executor} that executes tasks one at a time in serial order.
     * This serialization is global to a particular process.
     */
    public static final Executor SERIAL_EXECUTOR = AndroidVersionCheckUtils.hasHoneycomb() ? new SerialExecutor() : Executors.newSingleThreadExecutor(
            sThreadFactory);

    public static final Executor DUAL_THREAD_EXECUTOR = Executors.newFixedThreadPool(2,
            sThreadFactory);

    private static final int MESSAGE_POST_RESULT = 0x1;
    private static final int MESSAGE_POST_PROGRESS = 0x2;

    private static final InternalHandler sHandler = new InternalHandler();

    private static volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;
    private final WorkerRunnable<Params, Result> mWorker;
    private final FutureTask<Result> mFuture;

    private volatile Status mStatus = Status.PENDING;

    private final AtomicBoolean mCancelled = new AtomicBoolean();
    private final AtomicBoolean mTaskInvoked = new AtomicBoolean();

    @TargetApi(11)
    private static class SerialExecutor implements Executor
    {
        final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
        Runnable mActive;

        public synchronized void execute(final Runnable r)
        {
            mTasks.offer(new Runnable()
            {
                public void run()
                {
                    try
                    {
                        r.run();
                    }
                    finally
                    {
                        scheduleNext();
                    }
                }
            });
            if (mActive == null)
            {
                scheduleNext();
            }
        }

        protected synchronized void scheduleNext()
        {
            if ((mActive = mTasks.poll()) != null)
            {
                THREAD_POOL_EXECUTOR.execute(mActive);
            }
        }
    }

    /**
     * Indicates the current status of the task. Each status will be set only
     * once during the lifetime of a task.
     */
    public enum Status
    {
        /**
         * Indicates that the task has not been executed yet.
         */
        PENDING,
        /**
         * Indicates that the task is running.
         */
        RUNNING,
        /**
         * Indicates that {@link AsyncTask#onPostExecute} has finished.
         */
        FINISHED,
    }

    /**
     * @hide Used to force static handler to be created.
     */
    public static void init()
    {
        sHandler.getLooper();
    }

    /**
     * @hide
     */
    public static void setDefaultExecutor(Executor exec)
    {
        sDefaultExecutor = exec;
    }

    /**
     * Creates a new asynchronous task. This constructor must be invoked on the
     * UI thread.
     */
    public AsyncTask()
    {
        mWorker = new WorkerRunnable<Params, Result>()
        {
            public Result call() throws Exception
            {
                mTaskInvoked.set(true);

                Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
                // noinspection unchecked
                return postResult(doInBackground(mParams));
            }
        };

        mFuture = new FutureTask<Result>(mWorker)
        {
            @Override
            protected void done()
            {
                try
                {
                    postResultIfNotInvoked(get());
                }
                catch (InterruptedException e)
                {
                    android.util.Log.w(LOG_TAG, e);
                }
                catch (ExecutionException e)
                {
                    throw new RuntimeException("An error occured while executing doInBackground()",
                            e.getCause());
                }
                catch (CancellationException e)
                {
                    postResultIfNotInvoked(null);
                }
            }
        };
    }

    private void postResultIfNotInvoked(Result result)
    {
        final boolean wasTaskInvoked = mTaskInvoked.get();
        if (!wasTaskInvoked)
        {
            postResult(result);
        }
    }

    private Result postResult(Result result)
    {
        @SuppressWarnings("unchecked") Message message = sHandler.obtainMessage(MESSAGE_POST_RESULT,
                new AsyncTaskResult<Result>(this, result));
        message.sendToTarget();
        return result;
    }

    /**
     * Returns the current status of this task.
     *
     * @return The current status.
     */
    public final Status getStatus()
    {
        return mStatus;
    }

    /**
     * Override this method to perform a computation on a background thread. The
     * specified parameters are the parameters passed to {@link #execute} by the
     * caller of this task.
     * <p/>
     * This method can call {@link #publishProgress} to publish updates on the
     * UI thread.
     *
     * @param params The parameters of the task.
     * @return A result, defined by the subclass of this task.
     * @see #onPreExecute()
     * @see #onPostExecute
     * @see #publishProgress
     */
    protected abstract Result doInBackground(Params... params);

    /**
     * Runs on the UI thread before {@link #doInBackground}.
     *
     * @see #onPostExecute
     * @see #doInBackground
     */
    protected void onPreExecute()
    {
    }

    /**
     * <p>
     * Runs on the UI thread after {@link #doInBackground}. The specified result
     * is the value returned by {@link #doInBackground}.
     * </p>
     * <p/>
     * <p>
     * This method won't be invoked if the task was cancelled.
     * </p>
     *
     * @param result The result of the operation computed by
     *               {@link #doInBackground}.
     * @see #onPreExecute
     * @see #doInBackground
     * @see #onCancelled(Object)
     */
    @SuppressWarnings({"UnusedDeclaration"})
    protected void onPostExecute(Result result)
    {
    }

    /**
     * Runs on the UI thread after {@link #publishProgress} is invoked. The
     * specified values are the values passed to {@link #publishProgress}.
     *
     * @param values The values indicating progress.
     * @see #publishProgress
     * @see #doInBackground
     */
    @SuppressWarnings({"UnusedDeclaration"})
    protected void onProgressUpdate(Progress... values)
    {
    }

    /**
     * <p>
     * Runs on the UI thread after {@link #cancel(boolean)} is invoked and
     * {@link #doInBackground(Object[])} has finished.
     * </p>
     * <p/>
     * <p>
     * The default implementation simply invokes {@link #onCancelled()} and
     * ignores the result. If you write your own implementation, do not call
     * <code>super.onCancelled(result)</code>.
     * </p>
     *
     * @param result The result, if any, computed in
     *               {@link #doInBackground(Object[])}, can be null
     * @see #cancel(boolean)
     * @see #isCancelled()
     */
    @SuppressWarnings({"UnusedParameters"})
    protected void onCancelled(Result result)
    {
        onCancelled();
    }

    /**
     * <p>
     * Applications should preferably override {@link #onCancelled(Object)}.
     * This method is invoked by the default implementation of
     * {@link #onCancelled(Object)}.
     * </p>
     * <p/>
     * <p>
     * Runs on the UI thread after {@link #cancel(boolean)} is invoked and
     * {@link #doInBackground(Object[])} has finished.
     * </p>
     *
     * @see #onCancelled(Object)
     * @see #cancel(boolean)
     * @see #isCancelled()
     */
    protected void onCancelled()
    {
    }

    /**
     * Returns <tt>true</tt> if this task was cancelled before it completed
     * normally. If you are calling {@link #cancel(boolean)} on the task, the
     * value returned by this method should be checked periodically from
     * {@link #doInBackground(Object[])} to end the task as soon as possible.
     *
     * @return <tt>true</tt> if task was cancelled before it completed
     * @see #cancel(boolean)
     */
    public final boolean isCancelled()
    {
        return mCancelled.get();
    }

    /**
     * <p>
     * Attempts to cancel execution of this task. This attempt will fail if the
     * task has already completed, already been cancelled, or could not be
     * cancelled for some other reason. If successful, and this task has not
     * started when <tt>cancel</tt> is called, this task should never run. If
     * the task has already started, then the <tt>mayInterruptIfRunning</tt>
     * parameter determines whether the thread executing this task should be
     * interrupted in an attempt to stop the task.
     * </p>
     * <p/>
     * <p>
     * Calling this method will result in {@link #onCancelled(Object)} being
     * invoked on the UI thread after {@link #doInBackground(Object[])} returns.
     * Calling this method guarantees that {@link #onPostExecute(Object)} is
     * never invoked. After invoking this method, you should check the value
     * returned by {@link #isCancelled()} periodically from
     * {@link #doInBackground(Object[])} to finish the task as early as
     * possible.
     * </p>
     *
     * @param mayInterruptIfRunning <tt>true</tt> if the thread executing this task should be
     *                              interrupted; otherwise, in-progress tasks are allowed to
     *                              complete.
     * @return <tt>false</tt> if the task could not be cancelled, typically
     * because it has already completed normally; <tt>true</tt>
     * otherwise
     * @see #isCancelled()
     * @see #onCancelled(Object)
     */
    public final boolean cancel(boolean mayInterruptIfRunning)
    {
        mCancelled.set(true);
        return mFuture.cancel(mayInterruptIfRunning);
    }

    /**
     * Waits if necessary for the computation to complete, and then retrieves
     * its result.
     *
     * @return The computed result.
     * @throws CancellationException If the computation was cancelled.
     * @throws ExecutionException    If the computation threw an exception.
     * @throws InterruptedException  If the current thread was interrupted while waiting.
     */
    public final Result get() throws InterruptedException, ExecutionException
    {
        return mFuture.get();
    }

    /**
     * Waits if necessary for at most the given time for the computation to
     * complete, and then retrieves its result.
     *
     * @param timeout Time to wait before cancelling the operation.
     * @param unit    The time unit for the timeout.
     * @return The computed result.
     * @throws CancellationException If the computation was cancelled.
     * @throws ExecutionException    If the computation threw an exception.
     * @throws InterruptedException  If the current thread was interrupted while waiting.
     * @throws TimeoutException      If the wait timed out.
     */
    public final Result get(long timeout,
                            TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
    {
        return mFuture.get(timeout, unit);
    }

    /**
     * Executes the task with the specified parameters. The task returns itself
     * (this) so that the caller can keep a reference to it.
     * <p/>
     * <p/>
     * Note: this function schedules the task on a queue for a single background
     * thread or pool of threads depending on the platform version. When first
     * introduced, AsyncTasks were executed serially on a single background
     * thread. Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this
     * was changed to a pool of threads allowing multiple tasks to operate in
     * parallel. Starting {@link android.os.Build.VERSION_CODES#HONEYCOMB},
     * tasks are back to being executed on a single thread to avoid common
     * application errors caused by parallel execution. If you truly want
     * parallel execution, you can use the {@link #executeOnExecutor} version of
     * this method with {@link #THREAD_POOL_EXECUTOR}; however, see commentary
     * there for warnings on its use.
     * <p/>
     * <p/>
     * This method must be invoked on the UI thread.
     *
     * @param params The parameters of the task.
     * @return This instance of AsyncTask.
     * @throws IllegalStateException If {@link #getStatus()} returns either
     *                               {@link Status#RUNNING} or
     *                               {@link Status#FINISHED}.
     * @see #executeOnExecutor(Executor, Object[])
     * @see #execute(Runnable)
     */
    public final AsyncTask<Params, Progress, Result> execute(Params... params)
    {
        return executeOnExecutor(sDefaultExecutor, params);
    }

    /**
     * Executes the task with the specified parameters. The task returns itself
     * (this) so that the caller can keep a reference to it.
     * <p/>
     * <p/>
     * This method is typically used with {@link #THREAD_POOL_EXECUTOR} to allow
     * multiple tasks to run in parallel on a pool of threads managed by
     * AsyncTask, however you can also use your own {@link Executor} for custom
     * behavior.
     * <p/>
     * <p/>
     * <em>Warning:</em> Allowing multiple tasks to run in parallel from a
     * thread pool is generally <em>not</em> what one wants, because the order
     * of their operation is not defined. For example, if these tasks are used
     * to modify any state in common (such as writing a file due to a button
     * click), there are no guarantees on the order of the modifications.
     * Without careful work it is possible in rare cases for the newer version
     * of the data to be over-written by an older one, leading to obscure data
     * loss and stability issues. Such changes are best executed in serial; to
     * guarantee such work is serialized regardless of platform version you can
     * use this function with {@link #SERIAL_EXECUTOR}.
     * <p/>
     * <p/>
     * This method must be invoked on the UI thread.
     *
     * @param exec   The executor to use. {@link #THREAD_POOL_EXECUTOR} is
     *               available as a convenient process-wide thread pool for tasks
     *               that are loosely coupled.
     * @param params The parameters of the task.
     * @return This instance of AsyncTask.
     * @throws IllegalStateException If {@link #getStatus()} returns either
     *                               {@link Status#RUNNING} or
     *                               {@link Status#FINISHED}.
     * @see #execute(Object[])
     */
    public final AsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec,
                                                                       Params... params)
    {
        if (mStatus != Status.PENDING)
        {
            switch (mStatus)
            {
                case RUNNING:
                    throw new IllegalStateException(
                            "Cannot execute task:" + " the task is already running.");
                case FINISHED:
                    throw new IllegalStateException(
                            "Cannot execute task:" + " the task has already been executed " + "(a task can be executed only once)");
            }
        }

        mStatus = Status.RUNNING;

        onPreExecute();

        mWorker.mParams = params;
        exec.execute(mFuture);

        return this;
    }

    /**
     * Convenience version of {@link #execute(Object...)} for use with a simple
     * Runnable object. See {@link #execute(Object[])} for more information on
     * the order of execution.
     *
     * @see #execute(Object[])
     * @see #executeOnExecutor(Executor, Object[])
     */
    public static void execute(Runnable runnable)
    {
        sDefaultExecutor.execute(runnable);
    }

    /**
     * This method can be invoked from {@link #doInBackground} to publish
     * updates on the UI thread while the background computation is still
     * running. Each call to this method will trigger the execution of
     * {@link #onProgressUpdate} on the UI thread.
     * <p/>
     * {@link #onProgressUpdate} will note be called if the task has been
     * canceled.
     *
     * @param values The progress values to update the UI with.
     * @see #onProgressUpdate
     * @see #doInBackground
     */
    protected final void publishProgress(Progress... values)
    {
        if (!isCancelled())
        {
            sHandler.obtainMessage(MESSAGE_POST_PROGRESS,
                    new AsyncTaskResult<Progress>(this, values)).sendToTarget();
        }
    }

    private void finish(Result result)
    {
        if (isCancelled())
        {
            onCancelled(result);
        }
        else
        {
            onPostExecute(result);
        }
        mStatus = Status.FINISHED;
    }

    private static class InternalHandler extends Handler
    {
        @SuppressWarnings({"unchecked", "RawUseOfParameterizedType"})
        @Override
        public void handleMessage(Message msg)
        {
            AsyncTaskResult result = (AsyncTaskResult) msg.obj;
            switch (msg.what)
            {
                case MESSAGE_POST_RESULT:
                    // There is only one result
                    result.mTask.finish(result.mData[0]);
                    break;
                case MESSAGE_POST_PROGRESS:
                    result.mTask.onProgressUpdate(result.mData);
                    break;
            }
        }
    }

    private static abstract class WorkerRunnable<Params, Result> implements Callable<Result>
    {
        Params[] mParams;
    }

    @SuppressWarnings({"RawUseOfParameterizedType"})
    private static class AsyncTaskResult<Data>
    {
        final AsyncTask mTask;
        final Data[] mData;

        AsyncTaskResult(AsyncTask task, Data... data)
        {
            mTask = task;
            mData = data;
        }
    }
}